book Maths Puzzle Numerical Ability

Please Help me Factor X^2-5X+8^-2=2^-2

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book Other Question

I worked the following problem and came up with -216a^2.

Simplify: (-2a^4)^3(3a^-5)^2


I worked the following problem and came up with 3(a^2-5a^2-14).

Factor: 3a^2-15a^2-42
IF f(x) -5x-1, find the following
f(a-2)